SCAVENGING
•
It is the process of forcing out the burnt exhaust
gases from the cylinder for admitting the fresh charge into the cylinder.
•
This action takes place in the two stroke
cylinder.
SCAVENGING
PROCESS
•
The charge (air fuel mixture or air) enters the
engine cylinder from the crank case at a pressure higher than the exhaust
gases.
•
This fresh charge forces the exhaust gases to the
atmosphere through the exhaust port.
•
During the period both the transfer and exhaust
ports are kept open for a short period.
•
Hence there is a possibility of the fresh charge
escaping out with the burnt gases.
•
This is over come by designing the piston to have
a deflected shape.
•
This shape of piston deflects the fresh charge
upward in the engine cylinder.
•
It also helps out in forcing out the exhaust gases
to atmosphere.
•
This process is known as Scavenging.
Heat Engine:
•
Heat Engine is a machine which converts heat
energy supplied to it into mechanical work.
•
Heat energy is supplied to the engine by burning
the fuel.
Piston rings :
Piston rings are inserted in the grooves provided in the
piston. Two types of piston rings are used in the piston.
1. Compression
rings
2. Oil rings
or oil control rings
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